LangDefs causing save issues

[ProgramComputer]

Describe the bug
Langdefs is not updated when unsupported languages are added and searches by a few demo lang names unrecognized.
To Reproduce
Load the Demo in db
Try to save in TTS Speech settings.

Expected behavior
Cookies will exist

Server (please complete)
Linux install. Ran install.sh.

• LWT version: 2.8.0
  d8e2258

Additional context
Chinese and Chinese2 have both undefined array keys as it does not match traditional and simplified strings.
Maybe linked to #113 if so close.

[HugoFara]

Hi! Thank you for the suggestion, using cookies may be a nice way to solve the issue (I will have a deeper look at the code later on).

Langdefs was integrated incrementally in the code, it still needs some layers of refinement to cover all the options and use cases.

[ProgramComputer]

I meant for testing the issue. Cookies that were supposed to be set in Text-To-Speech will not show because it calls langdefs and blocks it.

lwt/text_to_speech_settings.php

Line 28 in d8e2258

return $langDefs[$language][1];

. I'm not suggesting to use cookies.